[USRP-users] 4*4 MIMO

Ben Hilburn ben.hilburn at ettus.com
Thu Sep 13 13:32:38 EDT 2012

Hi Farrukh -

I had originally interpreted your question to mean you wanted to use only
TVRX2s to achieve a full 2x2 MIMO system.  After re-reading your question,
however, I just realized that you may have been asking if you could use
TVRX2s for the receive portion of a full MIMO setup, while using a
different radio / USRP / daughterboard / etc for the transmit portion.

If this is your question, then YES, you are correct in your understanding.
Please pay careful attention to the synchronization notes I linked to you
before, as they will be critical to using the TVRX2s appropriately.

Sorry for the confusion!

Ben Hilburn <http://goo.gl/5DdZ3> @ Ettus Research, LLC<http://www.ettus.com/>
 |   USRP <http://goo.gl/Ixjhh>

On Thu, Sep 13, 2012 at 10:20 AM, Ben Hilburn <ben.hilburn at ettus.com> wrote:

> Farrukh -
> You cannot do MIMO, of any size, with the TVRX2, because the TVRX2 is
> receive-only.
> You can receive synchronized samples across two boards, although the
> boards will not maintain relative phase after a tune.
> Please see:
> http://files.ettus.com/uhd_docs/manual/html/sync.html
> Cheers,
> Ben
> ----------------------------
> Ben Hilburn <http://goo.gl/5DdZ3> @ Ettus Research, LLC<http://www.ettus.com/>
>  |   USRP <http://goo.gl/Ixjhh>
> On Tue, Sep 11, 2012 at 3:35 PM, Farrukh Aziz <farrukh59th at yahoo.com>wrote:
>> Hi, I was looking at this (new) document that shows different ways of
>> making a MIMO system.
>> http://www.ettus.com/content/files/kb/mimo_and_sync_with_usrp.pdf
>> Since it did not discuss one of the options that I have used, so I
>> thought to clarify myself. Can we implement a 2*2 MIMO by using a TVRX2
>> daughterboard on a USRP N210 without using any external reference signals?
>> Secondly can we implement a 4*4 MIMO by using 2 USRPs (N210) each fitted
>> with a TVRX2 daughterboard. The USRPs are inter linked with a MIMO cable.
>> The 1 PPS and 10 MHz synch signals are provided using a GPSDO (to the
>> master node). However the GPSDO is not connected with a GPS antenna.
>> Please let me know if my approach is correct.
>> *Farrukh Aziz Bhatti*
>> Department of Electrical & Computer Engineering
>> University of Auckland
>> +64 21 02973964
>> _______________________________________________
>> USRP-users mailing list
>> USRP-users at lists.ettus.com
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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